176 W. Theobald — On Indian and Burmese Species of Trionyx. [August, 



T. Javanicus, Geoff. 



T. Javanicus, Geoff, in Siebold's F. J., Chelonia, tab. V, f. 6 (skull). 

 J. stettatus, Geoff., Theobald, P. A. S. B. 1874, PL III. 



The sternal character of the species found at Maulmein, which I con- 

 sider identical with that from Java, may be seen by reference to my former 

 paper (1. c), but till a comparison is made with Javan specimens, the identity 

 of the two forms cannot be considered as established. The T. Javanicus 

 of Gray and Gunther is, of course, T. Gangeticus, as pointed out by Anderson. 



Sab. — Tenasserim, Java, &c. 



T. Peguensis, Gray. 



This species is as yet only known from the head of an adult in spirit, 

 brought from Pegu by mj-self. Gray describes it as a " pale olive green 

 minutely and closely punctulated with black. The upper lip, lower part 

 of the sides of the head, sides of the neck, chin and throat uniform greyish 

 white. The lower margin of the flap of the upper lip opaque white." 



This species is no doubt not rare in Pegu, and it is very desirable to 

 ascertain its sternal character and its colouration in a young state. A skele- 

 ton of probably this species exists in the Indian Museum, and another has 

 been carried home by Dr. Anderson. 



Sab. — Pegu. 



T. Gratii, n. sp., PI. III. 



The specimen which I have the pleasure of naming in honour of the 

 veteran zoologist so recently lost to us, was forwarded to me by Dr. Huiiger- 

 ford from the neighbourhood of Thayet-myo. The head was dried, but, on 

 moistening it, the colouration of the skin was seen closely to resemble that 

 of T. Phayrei, which I at first concluded it to be. The sternal characters, 

 however, indicated a totally different animal, as may be seen by referring to 

 the accompanying plate, wherein the shell is figured one third of the 

 natural size and the skull of the full size. The skull on extraction proved 

 to be very similar to that of T. Peguensis, Gray, but the style of colouration 

 of the head was so different from that of Peguensis that it clearly belonged 

 to some other species. The sternum of Peguensis is not known, unless a 

 skeleton in the Indian Museum may belong to it, but as I have no means 

 of ascertaining the colouration of the head of this specimen, I cannot say 

 to which species, T. Peguensis or the present one, it belongs. The man- 

 dible is furnished with a median, ridge (r fig. Ill) inside, wherein it differs 

 from ocellatus, which has a median mandibular furrow instead, all of which 

 marks in turn serve to diagnose it from its nearest allies, Phayrei, Peguensis, 

 and ocellatus. 



Sab. — The Irawadi valley. 



